From erobertson@stanford.edu Mon Aug 07 07:09:34 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!erobertson From: erobertson@stanford.edu (Emi Robertson) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug07.070934.2309@stanford.edu> Date: Mon, 07 Aug 1995 07:09:34 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Emi Robertson "The carrier frequency does not drift by accident." Atari Falcon 030 / AmigaOS 3.1 From tramirez@demon.co.uk Tue Aug 08 23:04:34 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!tramirez From: tramirez@demon.co.uk (Thiago Ramírez) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug08.230434.9082@demon.co.uk> Date: Tue, 08 Aug 1995 23:04:34 GMT References: <1995Aug07.070934.2309@stanford.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug07.070934.2309@stanford.edu>, erobertson@stanford.edu (Emi Robertson) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Thiago Ramírez *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From ncampbell@clari.net Thu Aug 10 21:53:34 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!ncampbell From: ncampbell@clari.net (Natalia Campbell) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug10.215334.9731@clari.net> Date: Thu, 10 Aug 1995 21:53:34 GMT References: <1995Aug07.070934.2309@stanford.edu> <1995Aug08.230434.9082@demon.co.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Aug08.230434.9082@demon.co.uk>, tramirez@demon.co.uk (Thiago Ramírez) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- Natalia Campbell Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------